Such is the human condition and one reason why we will never come together as a species. It's not in our genes to cooperate on a global scale. Unfortunately, we simply can't wrap our heads around taking care of billions of people in any meaningful way. So, here we are.
Please don't take my word for this since I can't seem to dig up the study itself, but do you believe in that one study that says happiness plateaus at $80k annual income?
I hate to hear again saying "rich/famous/successful/powerful (in financial alleviation or in job positions or achievements) people aren't still happy too." as if being rich or those such else won't still make happiness despite they can have already an easy access and freedom to do anything they want and will ever enjoy, unlike those people who keep working hoping for blessing or get through hardships, irrational maltreats, injustice, sacrifices and degradation just to reach that world.
So this gives me a different insight that:
Whether a man does or will ever reach wealth, everything or achievements (such as job, reputation, awards, credentials, "friends or company", admiration etc...), he might not yet consider those the happiness he always dream and aspire. Then what would he (human) be supposed to do to become happy if those weren't.
1) Does he like every decision he made? 2) Is he grieving/regretting? 3) Is he lonely all by himself? 4) Does he ever admire himself or his personality? 5) Does he ever like his story overall? 6) Does he ever enjoy this world he's currently living, 7) and so on I'm thinking reasons of his scenario.
So this is no longer about money/achievement, something beyond that I can't well describe.